PROBLEM TO BE SOLVED: To provide a tube coupling structure which allows a plurality of tubes to mutually achieve tension tolerance and twist tolerance.SOLUTION: The tube coupling structure 10 comprises: a first tubular body in which a basic central axis is defined a second tubular body arranged outside the first tubular body coaxially with the basic central axis and slidable along the axial direction of the basic central axis relative to the first tubular body an edge body formed on the first tubular body an opening edge part 32 which is formed on the second tubular body, and which comprises a first edge part superposable on the edge body, and a second edge part formed integrally with the first edge part in an opposing manner and having smaller axial width about the basic central axis compared with the first edge part and a coupling part which comprises a first fitting part fitted to the edge body, and a second fitting part formed integrally with the first fitting part, having smaller axial width about the basic central axis compared with the first fitting part, and held by the opening edge part 32.SELECTED DRAWING: Figure 4A
